Number of n X 2 0..1 arrays with each 1 adjacent to 1, 2 or 4 king-move neighboring 1s.

A296733

Number of n X 2 0..1 arrays with each 1 adjacent to 1, 2 or 4 king-move neighboring 1s.

Terms

    a(0) =2a(1) =11a(2) =31a(3) =88a(4) =287a(5) =881a(6) =2686a(7) =8347a(8) =25763a(9) =79376a(10) =245227a(11) =757045a(12) =2336222a(13) =7212287a(14) =22263871a(15) =68722504a(16) =212138639a(17) =654844841a(18) =2021399374a(19) =6239772643a(20) =19261292171a(21) =59456768000a(22) =183534426499a(23) =566544237805

External references